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eb2a2fd91f
This patch enables building of individual WAN protocol support routines (parts of generic HDLC) as separate modules. All protocol-private definitions are moved from hdlc.h file to protocol drivers. User-space interface and interface between generic HDLC and underlying low-level HDLC drivers are unchanged. Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Jeff Garzik <jeff@garzik.org>
161 lines
3.3 KiB
C
161 lines
3.3 KiB
C
/*
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* Generic HDLC support routines for Linux
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* Point-to-point protocol support
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*
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* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/errno.h>
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#include <linux/if_arp.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/pkt_sched.h>
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#include <linux/inetdevice.h>
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#include <linux/lapb.h>
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#include <linux/rtnetlink.h>
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#include <linux/hdlc.h>
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#include <net/syncppp.h>
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struct ppp_state {
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struct ppp_device pppdev;
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struct ppp_device *syncppp_ptr;
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int (*old_change_mtu)(struct net_device *dev, int new_mtu);
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};
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static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr);
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static inline struct ppp_state* state(hdlc_device *hdlc)
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{
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return(struct ppp_state *)(hdlc->state);
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}
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static int ppp_open(struct net_device *dev)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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void *old_ioctl;
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int result;
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dev->priv = &state(hdlc)->syncppp_ptr;
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state(hdlc)->syncppp_ptr = &state(hdlc)->pppdev;
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state(hdlc)->pppdev.dev = dev;
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old_ioctl = dev->do_ioctl;
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state(hdlc)->old_change_mtu = dev->change_mtu;
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sppp_attach(&state(hdlc)->pppdev);
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/* sppp_attach nukes them. We don't need syncppp's ioctl */
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dev->do_ioctl = old_ioctl;
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state(hdlc)->pppdev.sppp.pp_flags &= ~PP_CISCO;
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dev->type = ARPHRD_PPP;
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result = sppp_open(dev);
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if (result) {
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sppp_detach(dev);
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return result;
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}
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return 0;
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}
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static void ppp_close(struct net_device *dev)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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sppp_close(dev);
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sppp_detach(dev);
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dev->rebuild_header = NULL;
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dev->change_mtu = state(hdlc)->old_change_mtu;
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dev->mtu = HDLC_MAX_MTU;
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dev->hard_header_len = 16;
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}
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static __be16 ppp_type_trans(struct sk_buff *skb, struct net_device *dev)
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{
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return __constant_htons(ETH_P_WAN_PPP);
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}
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static struct hdlc_proto proto = {
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.open = ppp_open,
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.close = ppp_close,
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.type_trans = ppp_type_trans,
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.ioctl = ppp_ioctl,
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.module = THIS_MODULE,
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};
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static int ppp_ioctl(struct net_device *dev, struct ifreq *ifr)
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{
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hdlc_device *hdlc = dev_to_hdlc(dev);
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int result;
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switch (ifr->ifr_settings.type) {
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case IF_GET_PROTO:
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if (dev_to_hdlc(dev)->proto != &proto)
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return -EINVAL;
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ifr->ifr_settings.type = IF_PROTO_PPP;
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return 0; /* return protocol only, no settable parameters */
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case IF_PROTO_PPP:
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if(!capable(CAP_NET_ADMIN))
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return -EPERM;
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if(dev->flags & IFF_UP)
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return -EBUSY;
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/* no settable parameters */
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result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
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if (result)
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return result;
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result = attach_hdlc_protocol(dev, &proto, NULL,
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sizeof(struct ppp_state));
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if (result)
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return result;
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dev->hard_start_xmit = hdlc->xmit;
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dev->hard_header = NULL;
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dev->type = ARPHRD_PPP;
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dev->addr_len = 0;
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netif_dormant_off(dev);
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return 0;
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}
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return -EINVAL;
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}
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static int __init mod_init(void)
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{
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register_hdlc_protocol(&proto);
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return 0;
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}
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static void __exit mod_exit(void)
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{
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unregister_hdlc_protocol(&proto);
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}
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module_init(mod_init);
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module_exit(mod_exit);
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MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
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MODULE_DESCRIPTION("PPP protocol support for generic HDLC");
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MODULE_LICENSE("GPL v2");
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